JPS6416185A - Magnetic recording and reproducing device for television supervision - Google Patents

Abstract

PURPOSE:To continue a supervizing time and to erase an idle time by dividing the signal of an N system into the signals of (N+1) systems with a separating and synthesizing circuit and systematically recording them to a magnetic tape with an (N+1) magnetic heads. CONSTITUTION:In the case of two video signals, input signals 19 and 20 are frequency modulated by frequency modulators 17 and 18 and those modulated signals 15 and 16 are time-divided by a separating and synthesizing circuit 9. In the separating and synthesizing circuit 9, one unit time of a signal to be separated is selected to a time unit to be able to read and write the signal to the coiling angle 120 deg. of a magnetic tape 4 with the magnetic tape and the phase of the respective units of a first input signal 28 and the phase of the signal of the respective units of a second input signal 29 are dislocated by 180 deg. and separated. Thus, the first input signal and the second input signal go to be signals in which three systems are intermittent. At such a time, the separated signal is recorded to the magnetic tape 4 by magnetic heads 5-7.